where potholes come from


elkoholic

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Those forest roads have a layer of crushed rock as a top layer.  I'm not sure of the exact content but the Forest Service has multiple sites where they set up rock crushing equipment (makes one heck of a noise when they are operating), and overlay where there are active logging operations.  Some kind of sedimentary rock is all I know, but the ground water around here is high in calcium and magnesium.

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